Carbon black, slurry, and lithium ion secondary battery

Abstract

Carbon black having a specific surface area of 150 m 2 /g or more and 400 m 2 /g or less and a hydrochloric acid absorption amount of 30 mL/5 g or more, wherein, when a 3 mass % slurry is prepared using N-methyl-2-pyrrolidone as a dispersion medium, the slurry viscosity at 25° C. and a shear rate of 10 s −1 is 200 mPa·s or more and 1,200 mPa·s or less.

1 . Carbon black having a specific surface area of 150 m 2 /g or more and 400 m 2 /g or less and a hydrochloric acid absorption amount of 30 mL/5 g or more,
 wherein, when a 3 mass % slurry is prepared using N-methyl-2-pyrrolidone as a dispersion medium, the slurry viscosity at 25° C. and a shear rate of 10 s −1  is 200 mPa·s or more and 1,200 mPa·s or less.   
     
     
         2 . The carbon black according to  claim 1 ,
 wherein the DBP absorption is 200 mL/100 g or more and 350 mL/100 g or less.   
     
     
         3 . The carbon black according to  claim 1 ,
 wherein the ash content is 0.02 mass % or less.   
     
     
         4 . The carbon black according to  claim 1 ,
 wherein the iron content is less than 2,000 ppb by mass.   
     
     
         5 . A slurry comprising the carbon black according to  claim 1  and a dispersion medium. 
     
     
         6 . The slurry according to  claim 5 ,
 wherein the viscosity at a shear rate of 10 s −1  at 25° C. is 200 mPa·s or more and 1,200 mPa·s or less.   
     
     
         7 . A lithium ion secondary battery, comprising a positive electrode, a negative electrode and a separator,
 wherein at least one of the positive electrode and the negative electrode contains the carbon black according to  claim 1 .